金亚旭,董必坚,房大庆,张博文.镁合金表面稀土转化膜的磷酸盐致密化及性能[J].稀有金属材料与工程,2017,46(10):3077~3080.[Jin Yaxu,Dong Bijian,Fang Daqing,Zhang Bowen.Study on Phosphate Densification Technology and Properties of Rare Earth Conversion Films on Magnesium Alloy[J].Rare Metal Materials and Engineering,2017,46(10):3077~3080.]
镁合金表面稀土转化膜的磷酸盐致密化及性能
投稿时间:2015-07-21  修订日期:2016-08-07
中文关键词:  镁合金  稀土转化膜  致密化  耐蚀性
基金项目:太原科技大学校青年科技研究(项目编号:20133008)
中文摘要:
      本文首先在AZ91镁合金表面上制备出镧铈双稀土转化膜,然后利用(NH4)3PO4溶液进行致密化处理。采用扫描电镜(SEM)、X射线衍射仪(XRD)、高温氧化和电化学方法对致密化之后的转化膜形貌与性能进行研究。应用正交试验法确定的镧铈双稀土转化膜进行致密化处理的最佳工艺参数为:处理温度50℃、(NH4)3PO4质量浓度5%、致密处理时间4 min。SEM结果表明致密化后的膜层裂纹明显减少,表面致密性提高,很好的改善了基体的覆盖度。XRD谱分析表明经致密后的双稀土转化膜主要由稀土氧化物、氢氧化物、磷酸盐和氧化镁组成。电化学测试结果表明致密化后的膜层耐蚀性显著提高。高温氧化性实验表明致密化后的双稀土转化膜的高温氧化性能优于未经致密化处理的双稀土转化膜。
Study on Phosphate Densification Technology and Properties of Rare Earth Conversion Films on Magnesium Alloy
英文关键词:Mg alloy  conversion coating  density  corrosion resistance
英文摘要:
      The densification process of lanthanum and cerium conversion film on AZ91 magnesium alloy was achieved by ammonium phosphate, and the orthogonal expemenrit was used to optimize the densification process. The properties of the film were investigated by scanning electronic microscopy (SEM), X-ray diffractometer (XRD) and electrochemical methods. The results reveal that the treatment temperature was 50 ℃, (NH4)3PO4 mass concentration was 5%, densification of time was 4 min under the optimal treatment techniques. The SEM results show that after the densification of the rare earth conversion film, cracks in the films decreased significantly, and the denseness of the conversion coatings was improved. Results of XRD analysis indicated that the dual rare-earth conversion film with densification process are composed of rare earth oxides and hydrated hydroxides and phosphates and magnesium oxide . The electrochemical results show that the corrosion resistance of the conversion film is strengthened. High temperature oxidation test show that Lanthanum and Cerium conversion film with densification process is better than the film without densification process.
作者单位E-mail
金亚旭 太原科技大学材料科学与工程学院 hbjyx@163.com 
董必坚 太原科技大学材料科学与工程学院  
房大庆 太原科技大学材料科学与工程学院  
张博文 太原科技大学材料科学与工程学院  
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